Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8f737d2bac0fb2…

MALICIOUS

PDF

45.3 KB Created: 2020-08-08 14:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d6d5d4d7a775e608919291ca171393a SHA-1: 362423e7c8e8434052e92d831f7d04b1e80bef94 SHA-256: 6b8f737d2bac0fb26a8720a3a92d8e20efb72e89cb3cd79b838546041f6c50e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for downloading a PDF, combined with the authoring application details. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, suggesting a link farm designed to attract traffic and potentially distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=benevolo+history+of+modern+architecture+pdf
    • http://files.stanglphotography.com/uploads/1/3/1/3/131380058/pokudabosefuvi-vefomuziza-gokafipuj-musaxekuji.pdf
    • http://tuwokamu.belmontpianoacademy.com/uploads/1/3/1/4/131453329/0de2535de999633.pdf
    • http://nokarer.nc956.com/uploads/1/3/1/8/131871721/520e01.pdf
    • http://febexu.alwaysmoreleadsaruba.com/uploads/1/3/1/4/131406749/9046600.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/87614454794.pdf
    • https://cdn.shopify.com/s/files/1/0436/3960/3360/files/working_principle_of_smart_antenna.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/metallic_biomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/latevuwadowupomik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7679/files/nevejagez.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1458/files/pigirura.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/zevadodagulifufomomili.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/gmat_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/xadotuxadununi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4903/2607/files/list_of_states_and_their_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/najuni.pdf
    • https://cdn.shopify.com/s/files/1/0439/5093/2123/files/zafokuxob.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/63672718497.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000711d.bin
811e9cb6996f0e0c60731b15afc960b17cdd71dcdc99e2801c55f3259ad5fd8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711D 5608 bytes
font_01_sfnt_off00008412.bin
7ce224e3fda2765a02ecb6c3ae2723ec59ad4216bb14b2bc6d1ec2333e3fa23e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8412 10304 bytes

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